10 replies to this topic

[Johnnypompom]

Hi all,

 

As per the title really, my engine is a bone-stock 998 with a single HS2 carb. I'd like to do the classic stage 1 kit to make it go a bit better on country roads and improve MPG, but as far as I can see all kits are tailored for HS4 or HIF carbs. Apart from buying/making a carb adapter, is there some torquemaster-style (or other) intake manifold that fits an HS2?

[nicklouse]

Any reason you want to stay with the HS2?

[cal844]

Fit an HS4 carb then the HS4 stage one kit

[Johnnypompom]

Any reason you want to stay with the HS2?

Apart for not having to buy an HS4 and matching airbox, I thought it'd be fun to have something a bit off the beaten track :)

[Johnnypompom]

Fit an HS4 carb then the HS4 stage one kit

That's plan B, I just thought it'd be interesting to see what a "stage 1 HS2" would be like

Edited by Johnnypompom, 30 May 2022 - 02:39 PM.

[Steam]

You could cut the exhust off a standard manifold.
Or this.
https://www.google.c...mdH-xLjEhFLSotr

Edited by Steam, 31 May 2022 - 02:09 AM.

[Johnnypompom]

You could cut the exhust off a standard manifold.
Or this.
https://www.google.c...mdH-xLjEhFLSotr

Thanks for the reply! This thread did come up in my preliminary search, it seems that apart from cutting or finding an Oselli manifold a carb change is more or less compulsory then.

[timmy850]

Lynx in Australia makes a manifold that can be tapped for HS2

https://www.ebay.com...tm/283730515454

[stuart bowes]

might be a stupid question (I'd like to know the answer to this as well)  but I assume you already have a manifold for the carb so what benefit would a new one give you

 

if you do get one presumably it would need to be better flowed in some way, assuming you're at the limit of what your existing one is capable of ?  or what's the point

 

wouldn't it be better getting the exhaust on it's own, doing a bit of head work, and seeing where that gets you first 

[Johnnypompom]

Lynx in Australia makes a manifold that can be tapped for HS2

https://www.ebay.com...tm/283730515454

Good find! Any idea how they justify ±€250 for that? That seems a tad excessive…

[Johnnypompom]

might be a stupid question (I'd like to know the answer to this as well)  but I assume you already have a manifold for the carb so what benefit would a new one give you

 

if you do get one presumably it would need to be better flowed in some way, assuming you're at the limit of what your existing one is capable of ?  or what's the point

 

wouldn't it be better getting the exhaust on it's own, doing a bit of head work, and seeing where that gets you first 

I only have the cast iron manifold and single box peashooter exhaust that came with the car 50 years ago. I'm not really looking to get massive amounts of power or anything (especially since I'm on drums all around), but just to get a bit more torque for daily driving and a bit more MPG since I use the car often, so something like a freeflow manifold + RC40 exhaust would do the job nicely, hence the question about the intake manifold. One way to go around it would be to keep the cast iron manifold and go for a magic pipe + RC40, but I have no clue if that would actually give any noticeable result.

 

If I decide to go with head work, I'll probably ditch the single HS2 while I'm at it since the budget will clearly be higher. I'm not too keen to spend too much on mods since the car will probably be switched to electric in a few years, so there's little point in spending time and money on building up an engine that would be shelved down the line…